In gay culture, the hybrid between a twink and an otter. A thin guy who is not quite hairy or muscular enough to be an otter, but also not hairless or young-looking enough to be a twink.

Mark: Dude, that guy is so hot. I love otters.
Jamie: He is totally not hairy enough to be an otter. He's for sure a twink.
Mark: No way, he doesn't look that young and he's not hairless.
Jamie: Fine then, let's call him a twotter.

"I twatted her right in the twotter."
"Hey dude, she just flashed me her twotter"
" I dont believe that film got an 18 certificate, there was tits but no twotter!"
"You have such a lovely twotter"
"Shut up you twotter"
"God Geraldene you twotter smells like rotten tuna!"